NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
HEAO 1 high energy X-ray observations of the Virgo cluster and A2142Observations are reported of the Virgo cluster and Abell 2142 in the energy range of 15-150 keV, detected by using hard X-ray and low energy gamma-ray instruments on board the HEAO-1 spacecraft, during 1977 and 1978. The Virgo cluster was detected at a mean flux of (1.3 + or - 0.3) x 10 to the 0.001 photons/sq cm-s in the 20-100 keV band, and A2142 was detected marginally at a flux of (2 + or - 0.8) x 10 to the 0.001 photons/sq cm-s in the 15-40 keV band. Inverse Compton emission was not observed in these clusters. Results are used to derive limits to the intracluster magnetic field of B approximately greater than 5 x 10 to the -7th gauss and B approximately 5 x 10 to the -8th gauss in the Virgo cluster and A1242, respectively. There is some evidence for variability in these sources, which implies that the hard X-ray emission originates in a relatively compact object or region rather than from the cluster as a whole.
Document ID
19810053449
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lea, S. M.
(California, University Berkeley; San Francisco State University, San Francisco, CA, United States)
Reichert, G.
(California, University Berkeley, CA, United States)
Mushotzky, R.
(NASA Goddard Space Flight Center Laboratory for High Energy Astrophysics, Greenbelt, MD, United States)
Baity, W. A.
(San Francisco State Univ. CA, United States)
Gruber, D. E.
(San Francisco State Univ. CA, United States)
Rothschild, R.
(California, University La Jolla, CA, United States)
Primini, F. A.
(MIT Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
81A37853
Funding Number(s)
CONTRACT_GRANT: NAS8-33357
CONTRACT_GRANT: NAS8-27974
CONTRACT_GRANT: NSF AST-78-21070
CONTRACT_GRANT: NAS8-33011
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available